Can brewing a simple cup of tea send ripples through the U.K.’s power grid?

It might this summer.

As football fans pull on their jerseys for the World Cup, the U.K.’s grid operator is bracing for a sharp spike in electricity demand when England and Croatia face off in their opening match on June 17. One of the biggest surges is expected at half-time, as hundreds of thousands of viewers leave their couches and switch on their kettles all at once.